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Full Discussion: slow network on RHEL5
Operating Systems Linux Red Hat slow network on RHEL5 Post 302351819 by Radar on Wednesday 9th of September 2009 04:33:44 PM
Old 09-09-2009
Just a stab - Sometimes the slowness with SSH is that the remote sshd is trying to do a reverse DNS lookup to the client. Try commenting out any DNS servers in /etc/resolve.conf on the "slow" server and test. If that works, chances are. it's because your server is unable to communicate with the DNS server.
 

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unbound-streamtcp(1)						      unbound						      unbound-streamtcp(1)

NAME
unbound-streamtcp - unbound DNS lookup utility SYNOPSIS
unbound-streamtcp [-unsh] [-f ipaddr[@port]] name type class DESCRIPTION
unbound-streamtcp sends a DNS Query of the given type and class for the given name to the DNS server over TCP and displays the response. If the server to query is not given using the -f option then localhost (127.0.0.1) is used. More queries can be given on one commandline, they are resolved in sequence. The available options are: name This name is resolved (looked up in the DNS). type Specify the type of data to lookup. class Specify the class to lookup for. -u Use UDP instead of TCP. No retries are attempted. -n Do not wait for the answer. -s Use SSL. -h Print program usage. -f ipaddr[@port] Specify the server to send the queries to. If not specified localhost (127.0.0.1) is used. EXAMPLES
Some examples of use. $ unbound-streamtcp www.example.com A IN $ unbound-streamtcp -f 192.168.1.1 www.example.com SOA IN $ unbound-streamtcp -f 192.168.1.1@1234 153.1.168.192.in-addr.arpa. PTR IN EXIT CODE
The unbound-streamtcp program exits with status code 1 on error, 0 on no error. AUTHOR
This manual page was written by Tomas Hozza <thozza@redhat.com>. NLnet Labs Mar 21, 2013 unbound-streamtcp(1)
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